Overview Of Internal Components: Internal Unit; Overview Of Internal Components: External Unit - Viessmann VITOCAL 200-S Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Overview of internal components: Internal unit

C
B
A
Fig. 40
Secondary circuit flow temperature sensor
?
Secondary circuit return temperature sensor
aJ
Secondary pump
sG
3-way diverter valve for "Central heating/DHW
lJ
heating"
Liquid gas temperature sensor (IRT)
A
Condenser
B
Pressure sensor (ITC) for determining condensa-
C
tion temperature in condenser

Overview of internal components: External unit

Danger
Contact with 'live' components can result in
severe injuries. Capacitors remain 'live' after the
power supply has been switched OFF.
Wait at least 4 min, until the capacitors have dis-
charged, before starting work on the external
unit.
58
D
E
F
G
aJ
?
lJ
sG
H
Flow temperature sensor, secondary circuit
D
upstream of instantaneous heating water heater
(LWT)
Secondary circuit air vent valve
E
High limit safety cut-out (STB) for the instantane-
F
ous heating water heater (type AWB-AC only)
Instantaneous heating water heater (type AWB-AC
G
only)
Drain & fill valve, secondary circuit
H